Improvement in tool-holders for grindstones



L. TRAVIS. TOOL HOLDER Fon'enmnswoms.

No. 174,034. Patented Feb. 22, 18-76.

Ink/Emmy N. PETERS, PHOTO L|THOGRAPH WASHINGTON D C UNITED STATES PATENT OFFICE.

LEWIS TRAVIS, OF WHEELING, WEST VIRGINIA.

IMPROVEMENT IN TOOL-HOLDERS FOR GRINDSTONES.

Specification forming part of Letters Patent No. 174,034, dated February 22, 1876; application filed December 17, 1875. I

To all whom it may concern:

. Be it known that I, LEWIS TRAVIS, of the city of Wheeling, Ohio county, West Virginia, have invented certain Improvements in Tool-Holders for Grindstones, of which the following is a specification, reference being had to the accompanying drawing.

My invention relates to an apparatus known as a grindstone-scraper and consists of an adjustable tool-holder, operating in connection with an adjustableframe or carriage, which is attached to an oscillating plate, called a tool rest. This tool-rest is grooved on its under side, and the carriage attached to it by means of a tongue or guide-piece fitting in the groove, which permits the tool-holder being put on from either edge of the tool-rest.

One object of my invention is to overcome the difiicult-y found in the use of the slotted toolplate in general use, to which the tool-holder is attached by means of a guide-piece working in the slot in the topvof the plate. In actual practice the slotted tool-plate is both dangerous and expensive, for the reason that during the process of grinding tools at various angles the end of the tool catches in the slot and wedges against the stone, and the result may be a crippled. hand and a broken tool-rest. This difficulty l overcome by substituting for the slotted plate a solid smooth-surfaced plate, with a groove on under side, as shown, to permit of attaching the tool-holder. Another object of my invention is to overcome the difficulty of the head-block of the tool-holder being ground away as the tool-rest is gradually pushed forward tp the stone,'it being found in practice that the tool-rest must be worked close to the stone, and from this cause it gradually wears toward the workman, and when the tool-holder is placed on the restplate for the purpose of truing the stone, it is found to be too long, and if the head-block is stationary it grinds away and becomes useless. I obviate this difliculty by so constructing the carriage with threaded bolts that the end block is made adjustab1e,as may be desired. The rods or bolts form a rest for the tool-holder, which is made adjustable by means of a screw-bolt.

Figure 1 is a perspective view of the toolholder and carriage as attached to the toolrest or plate ready for operation. Fig. 2 is a longitudinal section through center of toolholder and carriage. Fig. 3 is transverse sec.-

tion.-

In Fig. 1, D is the tool-rest F, the groove; B B, head-blocks of carriage; b b, bolts; 0, clamp or guide-piece; A, tool-holder.

Like letters refer to like parts.

I do not wish to broadly claim the tool-rest D combined with a tool-holder and connected by a groove and stud, for such I know to be in public use, but the manner of attaching the tool-holder by a guidepiece working in a groove on the under side of the tool-plate I consider of great importance, for reasons mentioned above; but

What I do claim, and desire to secure by Letters Patent, is A 1. In combination with the oscillating toolplate D, having the groove F on its under surface, the tool-carria-ge A, constructed substantially as herein shown.

2. The head-blocks B B, connected with adjus t able rods b b, and supporting the toolholder A, for the purpose specified.

LEWIS TRAVIS.

Witnesses:

JOHN P. GLAss, S. M. HOWARD. 

